Buddha shows the vitarka mudra

Buddha shows the vitarka mudra

In addition to its dimensions and its thoughtful air, this Buddha is represented performing the vitarka-mudra, that is meaning the symbolic gesture of teaching and argumentation.
With vitarka mudra, the circle formed by the index finger and thumb symbolizes the flow of information and energy. This mudra is most often associated with the Buddha, representing the transmission of his wisdom and used when explaining his teachings. It is a common hand gesture used in Buddha statuary, particularly those of ancient Thailand.
The Buddha statue is one of the images I saw in the area of Wat Yot Kaeo Siwichai in Mukdahan.